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Alternator whine

Old 12-14-2011, 12:40 PM
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Alternator whine

okay so I searched the site and read alot on alternator whine,but, nothing to suite my problem so, I have the Pioneer DEH63ub deck, 2 Dual amplifiiers both 4 channel, one bridged to run my 2 Schosche 12" subs and the other to run the front and rear 6.5" speakers.I also have a 500k Schosche cap and the wiring was all from Schosche (1600 watt wiring kit and dual amp wiring kit with wiring and connectors for the battery........etc). the total system power output is around 550 watts,new Eliminator Battery 850 CCA, stock 80 amp alternator),now here is the funny thing, when the audio system was first installed , no noise what so ever (without BIG 3), after replacing the battery, now i got noise (engine rpm increases so does whine). My power wire from battery is 8 gauge and ground is same size. Both amps wired from the cap and are both grounded from the cap, that is to say POWER wire to FUSE holder to POS on CAP to DISTRIBUTION BLOCK then split to both AMPS. Ground wire from each amp is connected to the NEG side of CAP and from there to CHASSIS GROUND. While the system was playing, I pulled the RCA's, from the amp, off by accident and then pushed them back into there respective connectors, would this damage the the system? The RCA's are from the Schosche kit. Also, the POWER WIRE from the battery and the RCA's are not together, POWER cable is on drivers side and RCA's are run down the centre console,but, along with RCA's is the REMOTE POWER ON for the I said before no noise until Battery eas changed and after accidently pulling out RCA's from AMP. Below are links to products used, highlight address and search Google, now to anybody who has BAD comments, KEEP THEM TO YOURSELF, this was a low budget install!!!!

Last edited by 87pontiac; 12-14-2011 at 01:05 PM. Reason: insert link
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Old 12-14-2011, 02:26 PM
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Pioneer decks are notorious for having grounding noise issues after pulling the RCAs in and out while the deck is running.

Which everything off, disconnect the RCA cables from the amps. Then start the car. Is there still noise, or is it only present with the deck plugged into the amps?

If its only when the deck is plugged in, you have damaged the outputs on the deck. On the deck side (not the amp side) ground all the RCA shields and see if the noise stops.
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Old 12-14-2011, 05:17 PM
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^ what he said. You can usually ground just one of the rca shields though.
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Old 12-14-2011, 07:22 PM
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Thanks guys for the quick response. I did pull the rca's off the deck and still had noise. I grounded the rca's to both deck chassis and car chassis still had noise (plugged into back of deck). I went to the amps and connected a VOM to chassis ground and checked each rca while still plugged in to amp input and all showed 0.006 ohms with VOM set on infinity(diode check setting). So it seems the rca's are grounding but what I did next significantly suppressed the whine, I went to the battery, bought some 4 awg grounded it to the sub frame of the car chassis, about 6 inches from the battery and grounded it to the battery NEG terminal. This dramatically reduced the noise to a very acceptable level. Again, I did not do the BIG 3 conversion but results from a 4 awg connection was noticeable. Eventually I will be adding another amp and the BIG 3 will be done as well as an alternator upgrade, also a dual battery setup with battery isolator. So, the Pioneer deck internal ground for the rca's, is that the pico fuse on the circuit board? If it is can i replace it?
Thanks Guys
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Old 12-15-2011, 02:44 PM
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try connecting the battery ground directly to the cap ground connection. do the big 3!!
when you do the dual battry setup, connect them together (don't bother isolating them)
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Old 12-15-2011, 04:04 PM
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Hey thanks for the info, I really didn't think with only 550 watts the Big 3 would be necessary, but, sounds more efficient. I could run a cable from the battery negative terminal to the negative side of the cap and leave both amps connected to the negative side of the cap, allowing the grounding to return directly to the battery instead of going through the vehicle chassis.
Now when adding the second battery what would be your your best or ideal setup? Isolating the batteries will prevent the Primary Battery from going dead when listening to the stereo without the car running.
Thanks Again!!!!

Last edited by 87pontiac; 12-15-2011 at 04:08 PM.
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Old 12-16-2011, 03:09 PM
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Isolating the primary battery will also completely nullify any reason for adding a 2nd battery with respect to listening with car running. It wil only ensure you can start your car, even if you've run the "system" battery down.
As Loud Brown suggested, don't isolate them, and let both batts help provide reseve power to your alt.
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Old 12-20-2011, 02:11 PM
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is your alternater a female..if it is that would explain the WHINNING!!!
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Old 12-20-2011, 09:05 PM
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sounds like a poor ground. check your terminal connection at the battery....if it's loose, or corroded, it could cause system noise. while you're at it, check all the gound/power connections, sometimes they may look good, but may have corrosion, or may be loose. wiring terminals with set screws are reaaly bad for both corrosion and loosening up on you. considering you noticed the noise after tinkering with the batt., I would start there.
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Old 02-18-2012, 05:31 PM
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mind if I ask, wut kinda car is this?
I would def check grounds b4 anything, wiggle ends, and w/e make sure everything is good, things can sometimes be deceiving and look good, until wiggled a bit, and u notice something like a end not tight etc
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